meta-inspur: Cleanup for Yocto override syntax change

Refer to: https://lore.kernel.org/openbmc/YQ1FD5q8KbhbXVBK@heinlein/

```
poky/scripts/contrib/convert-overrides.py meta-inspur

git grep "_[a-z0-9_/-]*[ :]" -- meta-inspur | grep ".bb"

git grep -l _fp5280g2 -- meta-inspur | xargs sed -i \
's/_fp5280g2/:fp5280g2/'
git grep -l _on5263m5 -- meta-inspur | xargs sed -i \
's/_on5263m5/:on5263m5/'
git grep -l _virtual  -- meta-inspur | xargs sed -i \
's/_virtual/:virtual/'

```

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I5ef5039691caf5e33fb865da0fdd70d95d7e3bdf
diff --git a/meta-inspur/meta-fp5280g2/recipes-phosphor/configuration/fp5280g2-yaml-config.bb b/meta-inspur/meta-fp5280g2/recipes-phosphor/configuration/fp5280g2-yaml-config.bb
index c10330b..1d4cfe1 100644
--- a/meta-inspur/meta-fp5280g2/recipes-phosphor/configuration/fp5280g2-yaml-config.bb
+++ b/meta-inspur/meta-fp5280g2/recipes-phosphor/configuration/fp5280g2-yaml-config.bb
@@ -28,11 +28,11 @@
         ${D}${datadir}/${BPN}/ipmi-sensors.yaml
 }
 
-FILES_${PN}-dev = " \
+FILES:${PN}-dev = " \
     ${datadir}/${BPN}/ipmi-extra-properties.yaml \
     ${datadir}/${BPN}/ipmi-fru-read.yaml \
     ${datadir}/${BPN}/ipmi-inventory-sensors.yaml \
     ${datadir}/${BPN}/ipmi-sensors.yaml \
     "
 
-ALLOW_EMPTY_${PN} = "1"
+ALLOW_EMPTY:${PN} = "1"